DC-5 looses power and distorts when hot. Please help!

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M

mickt

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I love my Boogie and I need some help. After the amp is on for a while (half hour) it begins to lose power and gets distorted, even with clean settings. I changed the tube and cleaned everything but the problem persists. Any ideas? I want my baby back!!
 
What tube did you change? My guess would be the Power Tube are failing. Were those replaced? Since it happens on both channels, it could be anything from V1 preamp to V6 Phase Inverter to the Power Tubes? When was the last time all of the pre-amp tubes were replaced?
 
I changed all the tubes when the trouble started. One of the power tubes was wonky and I figured they were all due. The same problem occurred before and after the tubes were changed. Some one recently said one of the capacitors might be shot. I guess checking them will be my next approach.
 

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